incubator-bluesky-dev mailing list archives

Site index · List index
Message view « Date » · « Thread »
Top « Date » · « Thread »
From Samul Kevin <lovesumm...@gmail.com>
Subject Re: Some questions about Dirac
Date Fri, 27 Mar 2009 06:16:12 GMT
2009/3/24 chen hecky <hecky.chen@gmail.com>

> Thank  J Aaron Farr,
> I have studied using Dirac(http://diracvideo.org/), which maybe replace
> the
> FFmpeg, but there are some problem in compiling the programmer from the
> programmers_guide.
>
>
>
> ////the programmer codes text.c
> *
> #include <errno.h>
> #include <stdio.h>
> #include <stdlib.h>
>
>
>
> /* Include Dirac Encoder Header file */
> #include <libdirac_encoder/dirac_encoder.h>
> //#include "/usr/local/include/dirac/libdirac_encoder/dirac_encoder.h"
> #define ENCBUF_SIZE (1024*1024)
> int main (int argc, char **argv)
> {
>    FILE *in;
>    FILE *out;
>    dirac_encoder_context_t enc_ctx;
>    dirac_encoder_t *encoder;
>    unsigned char *unc_frame;
>    int unc_frame_size;
>    unsigned char enc_frame[ENCBUF_SIZE];
>    int go = 1;
>    dirac_encoder_state_t state;
>    if (argc < 3)
>    {
>        printf ("Usage : %s input-file output-file\n", argv[0]);
>        exit(0);
>    }
>    /* open input file */
>    if ( (in = fopen (argv[1], "rb")) == NULL)
>    {
>        perror (argv[1]);
>        exit(errno);
>    }
>    /* open output file */
>    if ( (out = fopen (argv[2], "wb")) == NULL)
>    {
>        perror (argv[2]);
>        exit(errno);
>    }
> /* set flag to retrieve locally decoded frames from encoder */
> enc_ctx.decode_flag = 1;
> /* Initialise the encoder with the encoder context */
> if ( (encoder = dirac_encoder_init(&enc_ctx, 0)) == NULL)
> {
>    printf ("Error initialising the encoder\n");
>    exit(-1);
> }
> /* Calculate the size of an uncompressed frame */
> unc_frame_size = (encoder->enc_ctx.src_params.height *
>   encoder->enc_ctx.src_params.width) +
>   2*(encoder->enc_ctx.src_params.chroma_height
>            * encoder->enc_ctx.src_params.chroma_width);
> /* Allocate memory for an uncompressed frame */
> unc_frame = (unsigned char *)malloc(unc_frame_size);
> /* Main loop */
> do
> {
>    /*
>    * Read one frame of uncompressed data into the buffer and
>    * load it into the encoder
>    */
>    if ( fread( unc_frame, unc_frame_size, 1, in) == 1)
>    {
>         if (dirac_encoder_load( encoder, unc_frame, unc_frame_size ) < 0)
>         {
>              fprintf (stderr, "dirac_encoder_load failed. Unrecoverable
> error...\n");
>              exit(-1);
>         }
>    }
>    else
>    {
>         /* signal end of sequence to encoder */
>         dirac_encoder_end_sequence( encoder );
>    }
>    do
>    {
>         /*
>         * Frame loaded successfully, so now set up the encode
>         * buffer in the encoder handler before calling the
>         * encoding function.
>         */
>         encoder->enc_buf.buffer = enc_frame;
>         encoder->enc_buf.size = ENCBUF_SIZE;
>         /* Call the encoding function */
>         state = dirac_encoder_output (encoder);
>         /*
>         * Depending on the return value of the encode function
>         * take appropriate action
>         */
>         switch (state)
>         {
>         case ENC_STATE_AVAIL:
>             /*
>             * Encoded picture available in enc_buf. Write the
>             * buffer to the output file
>             */
>
>    /* Initialise the encoder context with presets for SD576I50 */
>    dirac_encoder_context_init (&enc_ctx, VIDEO_FORMAT_SD576I50);
>    /* override some of the preset defaults */
>    /* Set quality factor to 7.5 */
>    enc_ctx.enc_params.qf = 7.5;
>    /* set input video type to progressive video */
>    enc_ctx.source_params.source_sampling = 0;
>
>
>               fwrite (encoder->enc_buf.buffer, encoder->enc_buf.size,
>                       1, out);
>               /*
>               * In addition to the encoded picture, the following metadata
>               * is also available.
>               * encoded picture stats in encoder->enc_pstats
>               * encoded picture params in encoder->enc_pparams
>               */
>               break;
>          case ENC_STATE_BUFFER:
>               /*
>               * Encoder needs more data to continue processing
>               */
>               break;
>          case ENC_STATE_EOS:
>               /*
>               * End of sequence info available in enc_buf. Write the
>               * buffer to the output file
>               */
>               fwrite (encoder->enc_buf.buffer, encoder->enc_buf.size,
>                       1, out);
>               /*
>               * In addition to the encoded picture, the following metadata
>               * is also available.
>               * encoded sequence stats in encoder->enc_seqstats
>               */
>               break;
>          case ENC_STATE_INVALID:
>          default:
>               printf ("Irrecoverable error. quitting...");
>               free (unc_frame);
>               dirac_encoder_close(encoder);
>               exit(-1);
>               break;
>          }
>          if (encoder->decoded_frame_avail)
>          {
>               /*
>               * Locally decoded frame available in encoder->dec_buf
>               */
>          }
>          if (encoder->instr_data_avail)
>          {
>               /*
>               * Instrumentation data available in encoder->instr
>               */
>          }
>      } while (state == ENC_STATE_AVAIL);
>  } while (go);
>  /* Free the encoder resources */
>  dirac_encoder_close(encoder);
>  /* Free the uncompressed data buffer */
>  free (unc_frame);
>  fclose (in);
>  fclose (out);
> }
> *
> Some error:
>
> *root@:~/Desktop/Test# gcc -I/usr/local/include/dirac text.c
> text.c: In function ‘main’:

->>missing any header file which including the definition of
VIDEO_FORMAT_SD576I50?

>
> text.c:98: error: ‘VIDEO_FORMAT_SD576I50’ undeclared (first use in this
> function)



>
> text.c:98: error: (Each undeclared identifier is reported only once
> text.c:98: error: for each function it appears in.)
> text.c:103: error: ‘dirac_encoder_context_t’ has no member named
> ‘source_params’*
>
> If anyone had used Dirac, can you give some suggestions?
>
>
> Hecky @ Bluesky Dev Team XJTU
>



-- 
Bowen Ma a.k.a Samul Kevin @ Bluesky Dev Team    XJTU

Mime
  • Unnamed multipart/alternative (inline, None, 0 bytes)
View raw message